Round column clamp



Get. 7, 1924. A ALelosxso' C. M. MARKHAM ROUND COLUMN CLAMP Filed Nov.15 1919 (Q m: ,x

INVENTOR.

. A TTORNEYS.

Patented Ust. 7, i924,

UNTED STATES CHARLES lVI. MARKHAM, OF MILWAUKEE, WISCONSIN,

ROUND coLtiMN CLAMP.

Application filed November This invention relates more particularly toround column clamps for bonding or holding segmental forms or sectionstogether used in concrete construction.

It is one of the objects of the present invention to provide a roundcolumn clamp to facilitate the construction of concrete forms andcolumns and to avoid the waste of lumber in the construction thereof.

A further object of the invention is to provide a round column clampwhich is adjustable to columns of different diameters and which, whenadjusted will hold the segments or sections of the form firmly inposition.

A further object of the invention is: to provide a round column clamp inwhich the parts will be automatically maintained in clamping positionwhen tightened.

A further object of the invention is to provide a round column clampwhich may be easily and quickly applied to or removed from a form, andwhich is of the highest efficiency and yet of very simple constructionand is inexpensive to manufacture.

With the above and other objects in view the invention consists of theimproved round column clamp and its parts and combinations as set forthin the claims, and all equivalents thereof.

In the accompanying drawings, in which the same reference charactersindicate the same parts in all of the views:

Fig. l is a perspective view of sectors of a concrete column form shownclamped to gether by the improved round column clamp;

F ig. 2 is a face view of the clamp member and a portion of the clampingstrap; and

Fig. 3 is a longitudinal sectional view taken on line 3 3 of Fig. 2.

Referring to the drawing the numeral 5 indicates a flexible metal bandor strap of a length sufficient to encircle' the forms of an 15, 1919.serial no. 338,410.

ordinary concrete column of the maximum diameter. To one end of the bandis fastened by means of rivets 6, the base portion 7 of a clampingmember 8. The inner side of said base portion 7 is curved as indicatedby 7 and is provided with a channel 8 to receive the band and permit thebase portion to lie close against the form and the band to be flush withthe said inner surface of the base portion. The outer end side edgeportions of the base is provided with outwardly` extending parallel ears9 to receive therebetween a cam member l0 which is connected to the earsby a pivot pin l1. The band en gaging face 10 of the cam member iseccentric with relation to the pivot pin ll and opens in a directiontowards the connected end of the band and closes in the oppositedirection to clamp the free end of the band between the cam face and thebase portion. As thus constructed the greater the strain, the more firmthe cani member will clamp the band and maintain it in adjustedpositio-n. In order to form a more firm clamping surface the curved faceof the cam member is formed with transversely extending teeth l2 whichbite into the band when in closed position. The inner end of the baseportion 7 is angled upwardly to form a shoulder 13 which is adapted tobe engaged by any desirable means, (not shown) used for tightening theband around the form.

In use the band is placed around the form and the free end of the bandis extended between the ears and the base and the clamp, and the clampis swung to closed position. A band tightening device is then connectedto the free end of the band and to the base member and the band is drawntightly around the column form and will be automatically clamped inadjusted position and maintained in said position as long as desired.

From the foregoing description, it will be seen that the improved roundcolumn clamp is of very simple construction and. is well adapted for thevpurpose described.

What I claim as my invention is:

A. clamp for holding segmental forms together in constructing concretecolumns, comprising a horizontal curved clamping member having outwardlyextending ears near one end thereof, a circular flexible metal bandconnected to the inner side of the opposite end portion of the clampingmember and having its free end extending aroundrthe outerside oftheelempingmember and between the ears thereof; ende oem memberpositioned between the ears and pivotally connected thereto and havinga, rounded hub portion free from projections and an inwardly extending`oem surface with transversely extending teeth which automaticallyimpinge against the outersurface of the free end portion of the band andclump it to the smooth outer surface of the 10 In testimony whereof, Iaix my signa- 15 tu re.

CHARLES M. MARKHAM.

